users, including myself, experience a very slow webclient. on all browsers. like waiting for 30 secs to send or open your mail. not always but it happens during daytime when the lot has logged in.

these problems occur mostly only from the internal network, almost no problems from outside.

when measuring the server I can't see odd behaviour, proc.load nominal on 3 to 4 %, mem load on 30%, disk on 60%. networkinterface on 2 to 3%, iostat gives normal numbers, only the wait is mostly on 3 to 4 secs.

measuring the network doesnt give lots of collision or faulting connections that snoops all the bandwith.

the mailserver is on the DMZ, internal users log in from the office segment. no trouble on the firewall as well.

looking at the behaviuor of zimbra you'ld expect slow network connections (like now, writing this from the train home) so I decided to reconfig a bit on the internal switches. but that did not give any results so far.

I also didn't found any faulting hardware so far. but I could have mislooked of course